"No suitable context info for active keying set"
It seems to be related to to Keying Set ... see Blender Manual.

Try to delete under Scene Properties &gt; Keying Sets &gt; Keying Set (if accidentally created)

or clean under Timeline editor &gt; Keying menu &gt; Active Keying Set slot

... if not your case provide more info as Chris suggested.
Some useful links ...
What is a keying set and how does it fit into the animation workflow?
Why can I not keyframe this armature?